Driving mechanism for sewing-machines



A T. IIIIRCEr DRIVING IVIEGI'IANISM FOR SEWING MACHINES. APPLICATION FILED OCT. 17. i919.

14,394,320 Pamn'izfid 7 Mn 18,- 1921.

which mesh with relatively large bevel gears 24 and 25, as large as the arm 12 permlts and which may be integral with collars 26 and shaft 23 by suitable cap screws'28 having Washers 29 overlapping the outer ends of the shaft 21 and gears 22 and 23. This method of attachment of gears is illustrated as a practical means for providing a very small gear on the armature shaft without any undue expense in construction and assembling.

1 The requirement that the shafts 13 and 17 run at the same speed makes necessary the same ratio between the gears 22 and 24, and 23 and 25. Accordingly the gears on the armature shaft are preferably the samesize,

and the gears with which they mesh are also preferably alike. The gear 24 is limited as to its external diameter by the internal cross sectional area of the head around the shaft 13, and accordingly I position the gear 24 beneath the spool holder 40, closing an opening in the casing, slightly increase the size of this gear. It is equally desirable .to' make the gear 22 as small as possible in order that I may accomlish the greatest possible 5 eed reduction.

y the construction shown am enabled to make these gears in a practical fashion with aview to quantity production and provide gear teeth of a cross section capablenof deli-ve'ring the required power and adapted to i wear well.

j, Practice has demonstrated that a plain series motor may be used in'this manner and that very satisfactory results in the operation of a machine are accomplished by the using of this arrangement of gearing. The motor may be controlled through the usual foot or end operated rheostat. As is desirable, the power of the motor is increased when the machine slows down by reason of its use when sewing heavy fabric orthe like.

Having described my invention, I claim: 1. A standard sewing machine head, a needle bar and shuttle aetuating imeans suitably housed, an interconnectinghollow standard, am electric motor vertically mounted within said standard, and gears on the armature shaft of said motor in mesh-- ing engagement with corresponding gears on said needle bar and shuttle actuating means.

2. In a motor driven sewing machine having a standard head, a motor arranged within said head, a shuttle actuating member beneath the bed plate of said machine, a needle bar actuating member within the .horizontal arm of the machine, gears on said shuttle and needle bar actuating members in direct engagement with gears on the ends of the armature shaft of said motor.

whereby I am enabled to hollow upr pro ecting 3. In the usual sewing machine head, an electric motor mounted within the uprlght standard, needle bar and shuttle actuating shafts extending from said standard, two gears connecting one end of the armature shaft with the needle bar actuating shaft, and two gears connecting the other end of the armature shaft with the shuttle actuating shaft.

4. In the usual sewing machine head, an

electric motor mounted within the hollow standard thereof, having a vertical armature shaft, bevel gears on the ends thereof in meshing engagement with bevel gears on the needle bar and shuttle actuating shafts of said machine.

'5. In the usual sewing machine head, a motor mounted within the upright standard thereof, two bevel gears connecting the armature shaft with the needle bar actuating member of the machine, and two bevel gears connecting said shaft with the shuttle actuating member thereof.

6. In the usual sewing machine head, a

mechanism operating shaft therein, an elecuptrio motor mounted Within the hollow right portion thereof, agear-on the armature shaft of said motor in direct meshing engagement with a gear on said operating shaft.

7. In the usual sewing machine head, operating shafts therein, an electric motor mounted within the hollow standard thereof, a vertical armature shaft therefor, small equal sized pinions on, said shaft, equal sized gears on said o erating shafts in mesh with said inions.

8. n a sewing machine having a standard head, needle bar and shuttle actuating shafts therein, a motor mounted in the hollow portion between said shafts, large equal sized bevel gears on said shafts, and small equal sized bevel pinions on the armature shaft of said motor in mesh with said gears.

9. In the usual sewing machine headga needle bar operating shaft therein, a shuttle operating sh ft, a motor mounted within. the iglit portion thereof,'two pinions on the armature shaft ofsaid motor, and a" gear on each of said operatin shafts in mesh with said pinions, the size ofsaid ears being limited only'bythe sizeof said cad. 10. In the usual sewinginaphine head, having aneedle bar operating shaft within the horizontal armand a shuttle actuating shaft within said head below the bed plate,fa motor having an armature ishaft mounted within the upright portion bevel gear on said needle, bar actuating shaft'as large as can be contained on'sai shaft within and head's-small bevel inion on the armature shaft in wit said of said head, a. V

gear, and a duplicate gear set between the armature shaft and said shuttle actuating shaft. a

11. In the usual sewing machine head,

having an opening in the horizontal aIm' thereof above the upright portion, a needle bar operating head below the bed plate thereof, a motor having an armature shaft vertically mounted within the upright portion, a gear on shaft within the horizontal arm, a shuttle actuating shaft within said a duplicate gear set between the lower end of. the armature shaft and said shuttle actu{ a'ting shaft. I

'In testimony whereof, I hereunto afiix my signature.

ARTHUR Er. MACE.

said gear, and 15 

